One lens that is on the Nikon list is the 24-120 f/4 AFS, which from the reports from LLoyd Chambers, PhotoZone.de and others is a mediocre lens. The 50 mm f/1.4 is a considerably better lens, according to these sources.
Regards,
Bill
Bill,
Since I use this lens mostly with my D7000, I don't notice the soft edges and corners that probably would be noticeable on full-frame.
The unfortunate fact is that Nikon do not have a better FX zoom lens in this range with VR. For many of us the advantages of VR outweigh any slight increase in resolution that a prime lens, or a better quality zoom lens without VR, such as the 24-70/2.8, may offer.
Compare resolution at Photozone between the 20-120 VR at F5.6 and 50mm, with the prime AF-S 50mm/1.4 G at F5.6, using the Nikon D3X in both cases.
According to my calculations, the 50/1.4 has about 3% greater resolution in the centre, as measured in line-widths-per-picture-height at 50% MTF.
At the borders, that advantage increases to about 7.5% greater resolution, and at the extreme corners about 13% greater resolution.
Now let's consider what happens with hand-held shots when:
(1) The precise composition requires a 55mm lens and therefore a small amount of cropping is required in post processing.
(2) The shot with the 50mm prime requires a shutter speed of 1/4FL due to its lack of VR, whereas the 55mm shot with the 20-120/F4 VR can achieve a similar stability with 1/0.5FL, or 1/25th sec. (on the basis that VR provides a 3-stop advantage).
Which image will be technically better, sharper, more detailed, and/or less noisy?